固-液界面热整流现象的气体运动论分析  

Gas Kinetic Theory Analysis of Thermal Rectification in Solid-fluid Interface

作　　者：李凡 李海洋 张新欣[1] 王军[1] 夏国栋[1] LI Fan;LI Hai-Yang;ZHANG Xin-Xin;WANG Jun;XIA Guo-Dong(Key Laboratory of Enhanced Heat,Transfer and Energy Conservation Ministry of Education.College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与能源工程学院强化传热与过程节能教育部重点实验室,北京100124

出　　处：《工程热物理学报》2020年第4期1012-1017,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51776007,No.51576005,No.51506001);北京市教委科研计划科技一般项目(No.KM201610005016)。

摘　　要：本文采用非平衡态分子动力学模拟方法,研究了固-液界面体系中的热整流现象。系统的两端为固体,而流体处于中间夹层,两端固-液界面的势能参数不同。模拟计算结果表明,此系统实现热整流的原因是左右两端固体壁面对流体分子吸附特性的不对称性。基于气体运动论的分析表明,高低温固体壁面所吸附流体分子数、温度协调系数和系统压强在正反向传热过程中均存在一定差异,从而形成了热整流效应;并且两端固-液界面差异性越大,热整流现象越明显。The heat transfer through nanoscale confined fluids under transversal temperature gradients are investigated by using nonequilibrium molecular dynamics(NEMD)simulations.Due to the asymmetric adsorption on the heterogeneous structure,the thermal accommodation coefficients and the fluid pressure for the forward and backward directions are found to be different with each other,which in turn results in the thermal rectification effect.By increasing the discrepancy bewteen the left and right solid-fluid interface parameters,the thermal rectification effect can be enhanced.

关 键 词：热整流 分子动力学 气体运动论 

分 类 号：TK124[动力工程及工程热物理—工程热物理]